An Oath to the Stars achievements

Clear Stage 5 on Normal or higher difficulty with a A rank

Clear Stage 5 on Normal or higher difficulty with a S rank

Clear Stage 4 on Inferno difficulty

Clear Stage 3 on Hard or higher difficulty

Defeat Kanashimi on any difficulty

Clear Stage 5 on Inferno difficulty

Defeat Nintai on any difficulty

Clear Stage 2 on Hard or higher difficulty

Clear Stage 1 on Hard or higher difficulty

Defeat Seikatsu on any difficulty

Clear all stages in a single run on Hard or higher difficulty

Clear Stage 2 on Inferno difficulty